3blx | pdb_00003blx

Yeast Isocitrate Dehydrogenase (Apo Form)

spinqualitylabelsall models 3blx, resolution 2.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3blx is a 16 chain structure with sequence from Atcc 18824. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 3blv, 3blw Gene: IDH1 (ATCC 18824), IDH2 (ATCC 18824) Activity: Isocitrate dehydrogenase (NAD(+)), with EC number 1.1.1.41 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Function [IDH1_YEAST] Performs an essential role in the oxidative function of the citric acid cycle. Also binds RNA; specifically to the 5'-untranslated leaders of mitochondrial mRNAs. [IDH2_YEAST] Performs an essential role in the oxidative function of the citric acid cycle. Also binds RNA; specifically to the 5'-untranslated leaders of mitochondrial mRNAs. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Mitochondrial NAD(+)-specific isocitrate dehydrogenases (IDHs) are key regulators of flux through biosynthetic and oxidative pathways in response to cellular energy levels. Here we present the first structures of a eukaryotic member of this enzyme family, the allosteric, hetero-octameric, NAD(+)-specific IDH from yeast in three forms: 1) without ligands, 2) with bound analog citrate, and 3) with bound citrate + AMP. The structures reveal the molecular basis for ligand binding to homologous but distinct regulatory and catalytic sites positioned at the interfaces between IDH1 and IDH2 subunits and define pathways of communication between heterodimers and heterotetramers in the hetero-octamer. Disulfide bonds observed at the heterotetrameric interfaces in the unliganded IDH hetero-octamer are reduced in the ligand-bound forms, suggesting a redox regulatory mechanism that may be analogous to the "on-off" regulation of non-allosteric bacterial IDHs via phosphorylation. The results strongly suggest that eukaryotic IDH enzymes are exquisitely tuned to ensure that allosteric activation occurs only when concentrations of isocitrate are elevated. Allosteric motions in structures of yeast NAD+-specific isocitrate dehydrogenase.,Taylor AB, Hu G, Hart PJ, McAlister-Henn L J Biol Chem. 2008 Apr 18;283(16):10872-80. Epub 2008 Feb 6. PMID:18256028 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Isocitrate dehydrogenase

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